Having a very hard time in my PRECALC CLASS.(adsbygoogle = window.adsbygoogle || []).push({});

When they facto problems they start pulling numbers out of numbers that aren't there..

Example..

3(4x+5)^2 (4)(5x+1)^2 + (4x+5)^3 (2) (5x+1)(5)

Professor said this was the answer.

a) 2(4x+5)^2(5x+1)[6(5x+1)+5(4x+5)]

=

b) 2(4x+5)^2(5x+1)[50x+31] (After combining like terms)

My questions is

Where I labeled a) where did she get the 6 from and the 5 from?

I can see she got the 5 from the original problem, but I thought if she factored out a 2 as a GCF the 5 would be reduced to a smaller number, and the 6 comes out of no where.. HELP

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# Having a very hard time in my PRECALC CLASS

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